John has aged gracefully now at the age of 75 with distinguished gray hair and beard, unfortunately his SA node has failed and his heart rate is down to 40 beats per minute. An ECG shows bradycardia and his stroke volume is calculated to be 80 mL. John is short of breath and has low blood pressure and is feeling quite unwell. John's brother Jim is 78 years old and was a triathlete for many years and still swims and bikes five days a week. Jim's resting heart rate is 50 beats per minute and he feels great. His stroke volume has been calculated to be 120 mL per beat. Calculate the cardiac output for both John and Jim and explain why Jim feels so much better than
John.

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The Answer of John has aged gracefully now at the age of 75 with distinguished gray hair and beard, unfortunately his SA node has failed and his heart rate is down to 40 beats per minute. An ECG shows bradycardia and his stroke volume is calculated to be 80 mL. John is short of breath and has low blood pressure and is feeling quite unwell. John's brother Jim is 78 years old and was a triathlete for many years and still swims and bikes five days a week. Jim's resting heart rate is 50 beats per minute and he feels great. His stroke volume has been calculated to be 120 mL per beat. Calculate the cardiac output for both John and Jim and explain why Jim feels so much better than
John.

John Has Aged Gracefully Now at the Age of 75